Paper-making machine.



W. A. AITVKEN.

PAPER MAKING MACHINE. APPLICATION FILED DEC.22. I916- ]Patented Apr. 30, 1918.

PAPER-Maxine MACHINE,

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vented new and useful Improvements Relating to Paper-Making Machines, of which the following is a specification.

. My invention relates to machines for making or treating pulp, paper-paste, cardboard and the like and refers more particui mayrause a larly to animproved arrangement of heating and drainmg the drying, cylinders of such machines in ,a simple and effective manner.

- In existing machines of this kind, the wet pulp or'paper-paste is taken in at the wetend and passes over a plurality of drying cylinders until it reaches the dry-end of the machine in a practically dry condition, each cylinder having a different, '21. ersuperior temperature in sequence as the pulp passes from the one cylinder to the other toward the dry-end. Steam is used for heating the cylinders and is ordinarily let in at the wet-end' As the paper dries, the cylinders nearer the-,d ry-end cannot condense so much steam as those at the.wetend, and consequently the steam, passing through the cylinders near the dry-end to the discharge pi e, prevents the uniform ejection of the co densation water from the cylinders of lower-temperature at the wetend of the machine. Some cylinders will keep full of water because a partial vacuum has been created in the low-temperature or in the discharge pipe, and this blow-through of steam in the latter from the dry-end of the machine where condensation in the cylinders is not cylinders,

power occurs as a-heavy load of undischarged water in various cylinders produces much friction on walls and bearings and reatl reduces the drying capability of said cy inders. q

By my invention these drawbacks are avoided by the arrangement hereinafter described, which is so disposed as to keep the drying cylinders free from water; to

utilize the steam which blows through from the dry-end cylinders; to obtain as much Specification of Letters Eatent.

heat as possible from the exhaust steam from row I v Patented Apr. 3 1], I fid, Application filed December 22. 1916. Serial No. 133,3 1

into the inlet main for the wetend cylinders. a In the following "description reference is had to the annexed drawings, in which Figure l is a side elevation of so much of a paper making machine as is necessary to illustrate my improved arrangement; Figs.

2 and 3 show in side view and plan respectively a detail of a, modified part.

ith my arrangement of mains I pass.-

the exhaust steam from the driving engines and any live steam necessary to dry the pulp, paper-paste or the like, through a main inlet pipe 1 and induction pipe 2'into a group of cylinders A at the dry-end of the machine. From these cylinders the hot steam passes through eduction pipes 3 into the main outlet pipe 4 of the cylinders A. According to my invention the pipe 4 is directly connected to a'separate steam supply pipe 5 for the cylinders B at the wet-end of the machine, said pipe 5 passing the steam through induction pipes 6 to the cylinders B whence it passes through eduction pipes 7 into a separate discharge pipe 8. It is-advantageous to place the Pipe 5 at a higher level than the pipe 4 so that water of condensation can drain into the water pocket 9 provided at the end of the main 4.

By following a previous arrangement and making a separate discharge pipe 8 for the low-temperature cylinders 18, the steam blowing through from the dry-end is quickly taken up and consumed in the cylinders B owing to the rapid condensation which takes place in the latter. The water from these in Figs. 2 and" 3, so as charge a partial vacuum in the cylinders and this the dry-end.

draws all the ;water from the cylinders. at

The water pocket 9 dis charges through The tap 11 should .be closed when paper,

making or the like is interrupted.

Instead of the discharge pipe 8 being connected with the eduction pipes 7 of the cylinders B, the said pipes 7 can be arranged as to individually dis- 12 leading to the usual hot water receiver,

and so insure for the perfect drainage of into,an enlarged top 13 of the pipe condensation water from the cylinders B 'and'other parts.

' In a paper making machine with cylinders divided into groups, the combination with the dry-end cylinders, of an inlet main and an outlet main at alevel below that ofthe cylinders, a directconnection from the low level outlet main into a superposed inlet main for the wet-end cylinders, and a condnsation discharge at the connecting end of said outlet ain, as and for the purpose stated.

v WILLIAM ALEXANDER AITKEN. 

